... Reducing couplings has UL, FM and iso9000 certificate . GROOVED ELBOWBrief introduction SIZE FROM 11/4-8,THE MAX ... malleable iron pipe fittings are made of raw materials of high quality through casting and precision process by automatic pattern extruding ... America etc standard thread. Regularly available are the following items: Elbow, tee, cross. Socket, union, bushing, backnut, flange, nipple, etc. ...